blk-mq: provide helper for setting up an SQ queue and tag set (9316a9ed) · Commits · 戴 / test

block/blk-mq.c

+33 −0

Original line number	Diff line number	Diff line
		@@ -2507,6 +2507,39 @@ struct request_queue blk_mq_init_queue(struct blk_mq_tag_set set)
		}
		EXPORT_SYMBOL(blk_mq_init_queue);

		/*
		* Helper for setting up a queue with mq ops, given queue depth, and
		* the passed in mq ops flags.
		*/
		struct request_queue blk_mq_init_sq_queue(struct blk_mq_tag_set set,
		const struct blk_mq_ops *ops,
		unsigned int queue_depth,
		unsigned int set_flags)
		{
		struct request_queue *q;
		int ret;

		memset(set, 0, sizeof(*set));
		set->ops = ops;
		set->nr_hw_queues = 1;
		set->queue_depth = queue_depth;
		set->numa_node = NUMA_NO_NODE;
		set->flags = set_flags;

		ret = blk_mq_alloc_tag_set(set);
		if (ret)
		return ERR_PTR(ret);

		q = blk_mq_init_queue(set);
		if (IS_ERR(q)) {
		blk_mq_free_tag_set(set);
		return q;
		}

		return q;
		}
		EXPORT_SYMBOL(blk_mq_init_sq_queue);

		static int blk_mq_hw_ctx_size(struct blk_mq_tag_set *tag_set)
		{
		int hw_ctx_size = sizeof(struct blk_mq_hw_ctx);

+4 −0

Original line number	Diff line number	Diff line
		@@ -203,6 +203,10 @@ enum {
		struct request_queue blk_mq_init_queue(struct blk_mq_tag_set );
		struct request_queue blk_mq_init_allocated_queue(struct blk_mq_tag_set set,
		struct request_queue *q);
		struct request_queue blk_mq_init_sq_queue(struct blk_mq_tag_set set,
		const struct blk_mq_ops *ops,
		unsigned int queue_depth,
		unsigned int set_flags);
		int blk_mq_register_dev(struct device , struct request_queue );
		void blk_mq_unregister_dev(struct device , struct request_queue );